#include <bits/stdc++.h>
using namespace std;
//#define int long long
#define ff first
#define ss second
const int ForSpeed = [](){
ios_base::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
return 0;
}();
void solve(){
string str; cin >> str;
int m = (int)str.size();
string strw; cin >> strw;
int n = (int)strw.size();
vector<int> e, o;
int cur = 0;
for(int i = 0; i < m;){
if(str[i] == 'X'){
i++; continue;
} int j = i;
while(j < m && str[j] == '.') j++;
int l = j - i;
if(l >= 2){
if(l == 2) l++;
if(l & 1){
if(l > 5){ o.push_back(l); }
cur += (l - 1) / 2;
} else {
e.push_back(l); cur += l / 2;
}
} i = j;
} int cnt = 0;
if(cnt >= cur) cout << "N";
else cout << "Y";
for(int i = 0; i < n; i++){ cnt++;
if(strw[i] == 'C'){
if(!e.empty()){
int x = e.back() - 1;
cur--; e.pop_back();
if(x > 5){ o.push_back(x); }
} else if(!o.empty()){
int x = o.back() - 1;
o.pop_back(); e.push_back(x);
}
} if(cnt >= cur) cout << "N";
else cout << "Y";
} cout << "\n";
}
int main(){
int test; cin >> test;
while(test--){
solve();
}
}
